Explosive.



' NoDr-awing. I

of Ayr, Scotland, have invented aicertain.

ing to Explosives, the. following is a full, clear, andexactdc 10 areliable-to deteriorate when kept composition referred to, if allowed'toremain in contact Especially 1s this containing'one ormoremembers of theabove such explosives sides, being prepared of .removing stabilizing.properties moreover, entirely insoluble in nitroglycerin.

. substance,

p'oducts of decomposition,

UNI ED STATES rnnnnnrc LEWIS NATHAN, WIILLIAMRIN'TOUL,

PATENT; OFFICE.

AND FRANK BAKER, or srnvnivsroiv;

'soorLAnD, nssielvons T0 EL 1. DU PONT DE nnivroun's POWDER coMrA'nY, orI WILMINGTON, D L WARE, A conronarron 'OF'NEW JERSEY.

, n'xPLosIvn- Specification of Letters Patent. Application filed J uu'el, 1913. Serial No. 77 1,620.-

Patented Mar. 17. 1914,

To all whom it may concern;

Be it known that we, NA HAN, manager, chemist, and Arcleer Factory,

FRANI new and usef -ul Improvement-in and Belat and do hereby declarethat scriptionthereof," Q g This invention relates to-th'e stabilizingof propellant expllos'ives. f

' However carefully. pr

such as v nitrocellulose, nitroglycerin, nitrof mannite, and nitrostarcdergo a slow dc-'- composition even at :ordinary temperatures, with theresult that these substances, and

mixtures containing {013 001}- sider'able periods! .The-p'roducts'of thedean accelerating mentioned 'class of chemical compounds, and

, are

plosiv'e of-goo'd chemicalstability, that, be:

It is already known that vaseline'or min-' eral jelly exerts astabilizing action on explosives into which itfis introduced, It,

however, possesses certain disadvantages which limit thestabilizingeflects produced.

' it is an exceedingly it. For instance, complex substance, some: of thecomponents of'it being-very much less than others. It is,

other substances possess to a very high deand thus of rento which theyare added.

FREDERIO LEWIS WILLIAM Rir'rroun, chief 1 Emma, chemist,- all ofStevenston, in the. county epared, nitric esters,"

one or more {of them,

liable tobecome not- In 1udg1ngwh1ohsubstance"or substances fromthoroughly stab-v shall have added. to a it duced' into explosiveswith'the of the class known as derivatives of urea in which 1, 2 or 3 ofthehydrog en atoms are replaced by various radicals of which one or moreis an aromatic radical, such as phenyl, benzyl, n aphthyl.phe11anthryl,"etc., or a homologue of them. i

in effecting stabilization of or containing a nitric ester by-in'cludmgtherein one or more of "these substances-1n suitable quantity.

The followlng are examples of this class of compound refcrredtoz-Q- QsHs'Phenylurea. co \NH2 I. I N/CH; Methyl phenyl urea CO (fHs NH;

N C Methyl diphenylur aCO \CSH e of the mass is or are "the mostsuitable for use in any particular case, we are guided by the propertiesof the individual compounds, such as volatility, solubility, innitroglycerin, and the readiness with which they become nitrated. Asthese substances are introview of absorbing the products ofdecomposition by becoming nitrted, their higher nitro' deriva: tives areunsuitable for thisjpurpose because active in their:

ofthe increasing difliculty with which nitration occurs .as the degreeof nitration rises.

As an example of the use, according to our present invention of one ofthe above class of compounds an explosive 'ofthefollowing composltionmay be cited certain gree the power of-absorbing the harmful Thesesubstances possess the property of tion products of nitric esters andthus preaventing them from influence on the decomposition offtheseesters.- The action of any of, these f Sub:

Thisinvention consists therefore broadly 'combining or reacting with the(l8C0mPQS1 having any accelerating;

These substances are chemical compounds stances, when introduced as astabilizer into nitric esters or mixtures of them consistsalpparentlypartly in becoming nitrated by t nitrogen peroxid and oth erinjurious decomposition products of nitric esters. A further advantage,which some of these urea derivatives possess over mineral jelly, andsimilar previously proposed substances, is that of being sufiicientlysoluble in nitroglycerin. When bodies which are insoluble or onlyslightly soluble in nitroglycerin are added, to a nitroglycerinexplosive they often exhibit a tendency to separate out from thefinished explosive either in the form'of. crystals or as an. oil.

'L'An explosive containing at least onen1tr1c ester and a ureaderivative contalnmg 1n the amido groups at least one unsubstitutedhydrogen atom and at least one arothe nitric esters, and partly inreducing these acid products "to compounds which have no action on the'gether, nitroglycerin,

matio radical containing only carbon and hydrogen in substitution for ahydrogen atom of said groups. Y

2. An explosive containing nitroglycerin, nitrocellulose and a ureaderivative contain- 35 ing in the amido groups at least oneunsubstituted hydrogen atom and at least one aromatic radical insubstitution for a hydrogen atom of said groups.

3.An explosive containing niiroglycerin to nitrocellulose and" ethylphenyl urea. v

4. An explosive containing, gelatinized-t nitrocellulose and a ureaderivative containing in, the am'ido groups at least one unsubstitutedhydrogen 45 atom and at least one aromatic radical in substitution for ahydrogen atom of study groups.

5. An explosive. 'containing, gelatini'zed gethe-r, nitroglycerin,nitrocellulose and ethyl phenyl urea.

I11 testimony that ,we'claim the foregoing We-have hereunto set 'ourhands.

.FREDERIO LEWIS NATHAN.

WILLIAM RINTOUL. FRANK BAKER.

Witnesses: ERNEST HANSFQRD, M. B. MrtNn.

. M l :Ln \7 v I 0011190 01' this patent may be obtained for five centseach, by addressing the commissioner oflatent's,

' Washington, D. G. i I y

